Emission spectra of phosphor MgSO 4 doped with Dy and Dy/Mn were measured with an optical multichannel analyzer and a linear heating system whose temperature was controlled by a microcomputer. The emission spectrum bands at 480 nm and 580 nm of phosphor MgSO 4 doped with Dy were observed in the three dimensional (3D) glow curves. Compared with the 3D spectrum of CaSO 4:Dy and the spectrum bands of MgSO 4:Dy shows the same wavelengths which resulted from the quantum transitions among the energy levels of Dy 3+ ions. The intensities of the glow peaks in both spectrum bands (480nm and 580nm) of phosphor MgSO 4 doped with Dy/Mn were dramatically reduced except the 380℃ glow peak.